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2026-05-14Add simple_alu RTL and formal verificationChat5-0/+140
- simple_alu.sv: 32-bit ALU with add/sub, 33-bit extended overflow detection, and active-low synchronous reset - simple_alu_bind.sv: attaches checker to simple_alu without modifying RTL - simple_alu_top_fv.sv: replace bind (unsupported in open-source Yosys) with explicit wrapper that instantiates DUT and checker side-by-side - simple_alu_fv.sv: bind-based checker module observing DUT signals - simple_alu.sby: SymbiYosys config running BMC and cover tasks - README.md: verification plan tracking implemented and planned properties - .gitignore: exclude SymbiYosys output directories